Roll ANGLE from 68e60a92ae92 to 2761f01d68a7 (3 revisions)

https://chromium.googlesource.com/angle/angle.git/+log/68e60a92ae92..2761f01d68a7

2020-06-30 etienneb@chromium.org Disable the use of chromium worker threads
2020-06-30 lexa.knyazev@gmail.com Fix blendable FP32 texture caps on ES2 contexts
2020-06-30 ianelliott@google.com Vulkan: Fix off-by-1 180/270-rotated CopyTexImage

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/angle-chromium-autoroll
Please CC ianelliott@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/master/autoroll/README.md

Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win-asan;luci.chromium.try:win_optional_gpu_tests_rel;luci.chromium.try:linux-swangle-try-x64;luci.chromium.try:win-swangle-try-x86
Bug: chromium:1091259
Tbr: ianelliott@google.com
Test: Test: Test: angle_end2end_tests --gtest_filter=*CopyTexImageTestES3.2DArraySubImage*Vulkan*Test: Test: Test: angle_end2end_tests --gtest_filter=*WebGLReadOutsideFramebufferTest.CopyTexSubImage2D*Vulkan*
Change-Id: Ibd94d829cda3aadaf17bec66f1f66bdb3431fcbb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2274190Reviewed-by: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#784265}

DEPS

@@ -200,7 +200,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling ANGLE
   # and whatever else without interference from each other.
-  'angle_revision': '68e60a92ae925314c97bed32079acdf284c71eef',
+  'angle_revision': '2761f01d68a7578e1782e5c38fca5ec599f95a77',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling SwiftShader
   # and whatever else without interference from each other.